org.ops4j.pax.logging.log4j2.internal.PaxAppenderProxy Maven / Gradle / Ivy

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Pax Logging backend implementation based on Apache Log4J2. It provides Log4J2 specific implementation of PaxLoggingService interface and Log4J2 specific configuration methods. Users may customize Log4J2 behaviour (appenders, layouts) by creating fragment attached to this bundle.

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/*
 * Copyright 2006 Niclas Hedhman.
 *
 * Licensed  under the  Apache License,  Version 2.0  (the "License");
 * you may not use  this file  except in  compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed  under the  License is distributed on an "AS IS" BASIS,
 * WITHOUT  WARRANTIES OR CONDITIONS  OF ANY KIND, either  express  or
 * implied.
 *
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.ops4j.pax.logging.log4j2.internal;

import org.ops4j.pax.logging.PaxLoggingService;
import org.ops4j.pax.logging.spi.PaxAppender;
import org.ops4j.pax.logging.spi.PaxLoggingEvent;
import org.osgi.framework.BundleContext;
import org.osgi.framework.Constants;
import org.osgi.framework.Filter;
import org.osgi.framework.InvalidSyntaxException;
import org.osgi.util.tracker.ServiceTracker;

public class PaxAppenderProxy extends ServiceTracker implements PaxAppender
{

    private volatile int count = -1;
    private Object[] appenders = null;

    public PaxAppenderProxy(BundleContext bundleContext, String name)
    {
        super( bundleContext, createFilter( bundleContext, name ), null);
    }

    public static Filter createFilter( BundleContext bundleContext, String name )
    {
        try
        {
            return bundleContext.createFilter(
                        "(&(" + Constants.OBJECTCLASS + "=" + PaxAppender.class.getName() + ")" +
                            "(" + PaxLoggingService.APPENDER_NAME_PROPERTY + "=" + name + "))");
        }
        catch (InvalidSyntaxException e)
        {
            throw new IllegalStateException("unable to create appender tracker", e);
        }
    }


    public void doAppend( PaxLoggingEvent event )
    {
        if (count != getTrackingCount()) {
            count = getTrackingCount();
            appenders = getServices();
        }
        if (appenders != null) {
            for (Object appender : appenders) {
                // Bug in Karaf, as it expects the source to be available
                event.getLocationInformation();
                ((PaxAppender) appender).doAppend(event);
            }
        }
    }
}